BBH Capital Partners IV, L.P., today announced it has made a $45 million investment in Best Doctors, Inc., a 30 million-member global health company.

“Best Doctors provides proven medical cost containment solutions to employer groups and other parties around the globe,” Jeffrey Meskin, partner of Brown Brothers Harriman and Co. and co-manager of BBH Capital Partners, said in a statement. “Our team was especially impressed by the fact that Best Doctors is transforming health care and benefiting both employers and employer-insured individuals in the process.”

The investment is the largest made to date in the expanding business and adds BBH Capital Partners to Best Doctors’ other prominent supporters, including Nippon Life Insurance Company of Japan, the sixth-largest life insurer in the world, and Munich Re, the largest reinsurer in the world.

“We want to extend our deep appreciation to the BBH Capital Partners team for the tremendous vote of confidence they’ve made in Best Doctors with this investment,” said David Seligman, Best Doctors’ chairman and CEO.